Definition

For describing the frequency of

electric power supply grids

electrified railways, trams, buses or other means of transportation

communication devices for broadcasting and two-way telecommunications

Unit

The unit of the frequency is always Hertz (cycles per second). Values lower than 1000 Hz should have no unit (frequency=50). For greater values, the SI units 'kHz' (frequency=423 kHz), 'MHz' (frequency=88.0 MHz), or GHz' (frequency=2.4 GHz) should be used. The unit should be separated by a space from the value. As decimal separator always '.' should be used.

Examples

frequency=

0

For DC. This is used for most buses, trams, metros or light rail systems, as well as some railways.

16.67

For the railways with overhead lines in Sweden, Norway and Germany. In Germany only for railways which are not fed from the railway power grid (as in some regions in Mecklenburg-Vorpommern, Sachsen-Anhalt and Brandenburg).

16.7

For the railway power grids in Germany, Austria and Switzerland. Also for the railways with overhead lines, which are fed from these power grids (in Austria, Switzerland and most parts of Germany).

25

For the railway power grids in USA North-East region (DC, MD, DE, PA, NJ, NY) and for the railways with overhead lines, which are fed from these power grids (Washington DC - Bowery Bay Phase Break, SEPTA lines)

50

For the power grids in Europe, Australia and most parts of Africa, Japan in east region and Asia (see Wikipedia), also for some railways with overhead lines in this countries.

60

For the power grids in North America, most parts of South America, Japan in west region and some other countries (see Wikipedia), also for some railways with overhead lines in this countries.